With the development of precision agriculture, the research that applies Remote Sensing technology, especially hyperspectral remote sensing, to realize crop management, monitoring and yield estimation, has been concer...With the development of precision agriculture, the research that applies Remote Sensing technology, especially hyperspectral remote sensing, to realize crop management, monitoring and yield estimation, has been concerned. Nowadays, the growth-monitoring and yield-estimating methods in rice, wheat and other annual crops develop rapidly with some achievements having already been put into service. But the yield estimation research on perennial economic crops is few. Taking peren- nial citrus trees as the research object, using ASD spectrometer to collect citrus canopy spectral, this article studied and analyzed the citrus of veget＆tion index and its relationship on yield, synthetically considered the influence of the agriculture pa- rameters on crop yield, and finally constructed the citrus yield estimation model based on the spectral data and agronomic parameters. Through the Significance Test and Samples＇ Test, olutained that the model＇s fitting degree was R=0.631, F= 13.201, P〈0.01 and the error rate of estimating accuracy was controlled in the range 3%-16%, proving that the model has statistical signification and reliability. It concluded that hyperspectral acquired from citrus canopy has substantial potential for citrus yield estimation. This study is an application and exploration of Hyperspectral Remote Sensing technology in the citrus yield estimation.展开更多
On August 7,2015 the project＂Development of package technology for producing biodiesel from microalgae＂,which was jointly undertaken by the SINOPEC Research Institute of Petroleum Processing（RIPP）,the Fushun Resea...On August 7,2015 the project＂Development of package technology for producing biodiesel from microalgae＂,which was jointly undertaken by the SINOPEC Research Institute of Petroleum Processing（RIPP）,the Fushun Research Institute of Petroleum and Petrochemicals（FRIPP）.展开更多
The study was undertaken to assess the inorganic fertilizer production and consumption, export and import trends in Nigeria, assess the effect of food legume technology on farmers＇output, income, household inventorie...The study was undertaken to assess the inorganic fertilizer production and consumption, export and import trends in Nigeria, assess the effect of food legume technology on farmers＇output, income, household inventories and inorganic fertilizer usage. Multi-stage sampling technique procedure was adopted in obtaining 300 respondents. Primary and secondary data were used. Simple descriptive statistics, t-test and correlation were used to analyse the data. Both the trend analysis result and test of mean differences showed a wide gap. The result revealed a significant increase in the yields of maize, millet, cocoyam, sweet potato, okro, tomato and overall aggregate crop yield of farmers after the adoption of the food legume technology （t = 2.78, 2.23, 3.70, 3.30, 2.20, 3.5 and 2.297; P 〈 0.05）, hence improves food security. Similarly, the result revealed significant positive change in terms of farmers＇ownership of house, increase in the number of rooms, improvement in water source, possession of radio, television/tape recorders and cell phone. Major constraints to production as revealed by the study include pests and diseases, low soil fertility, inadequate finance, storage problem and poor market for products. The study recommends adequate and regular supply of food legume production inputs to farmers and intensive control of pests and diseases.展开更多
Based on trade in value-added, this paper has estimated the revealed comparative advantage （RCA） of China＇s various manufacturing sectors between 1995 and 2011 and compared with the RCA indexes measured using conve...Based on trade in value-added, this paper has estimated the revealed comparative advantage （RCA） of China＇s various manufacturing sectors between 1995 and 2011 and compared with the RCA indexes measured using conventional aggregate accounting approach. Results indicate that： （1） the RCA index measured using conventional aggregate accounting approach has underestimated China＇s comparative advantage of labor-intensive sectors but overestimated China＇s comparative advantage in capital, knowledge and technology-intensive manufacturing sectors, giving rise to a serious misjudgment. （2） The RCA measured using value-added approach shows that in the industry chain layout of global manufacturing sectors, China＇s comparative advantage is still concentrated in labor-intensive manufacturing sectors but has signs of weakening; in capital, knowledge and technology-intensive sectors, China is yet to develop any significant comparative advantage; there are signs that China is developing comparative advantage in capital-intensive sectors yet China＇s comparative disadvantage in knowledge and technology-intensive sectors has no significant tendency to improve. This result not only helps correct the misjudgment of China＇s competitiveness in manufacturing sectors based on conventional aggregate accounting approach but offers important policy implications for setting strategic directions and policies for China＇s manufacturing transition and upgrade.展开更多
This paper presents thermodynamic evaluations of the agriculture residual-to-SNG process by thermochemical conversion, which mainly consists of the interconnected fluidized beds, hot gas cleaning, fluidized bed methan...This paper presents thermodynamic evaluations of the agriculture residual-to-SNG process by thermochemical conversion, which mainly consists of the interconnected fluidized beds, hot gas cleaning, fluidized bed methanation reactor and Selexol absorption unit. The process was modeled using Aspen Plus soft-ware. The process performances, i.e., CH4 content in SNG~ higher heating value and yield of SNGexergy efficiencies with and without heat recovery, unit power consumption, were evaluated firstly. The results indicate that when the other parameters remain unchanged, the steam-to-biomass ratio at carbon boundary point is the optimal value for the process. Im proving the preheating temperatures of air and gasifying agent is beneficial for the SNG yield and exergy effi ciencies. Due to the effects of COz removal efficiency, there are two optimization objectives for the SNG produc tion process： （I） to maximize CH4 content in SNC or （II） to maximize SNG yield. Further, the comparison among different feedstocks indicates that the decreasing order of SNG yield is： corn stalk 〉 wheat straw 〉 rice straw. The evaluation on the potential of agriculture-based SNG shows that the potential annual production of agriculture re sidual-based SNG could be between 555 108 - 611 108 m3 with utilization of 100% of the available unexplored resources. The agriculture residual-based SNG could play a significant role on solving the big shortfall of China＇s natural gas supply in future.展开更多
基金Supported by the central university basic scientific research fund(XDJK2009C006)from Ministry of Educationthe National Youth Science Fund(41201436)from National Science Counci~~
文摘With the development of precision agriculture, the research that applies Remote Sensing technology, especially hyperspectral remote sensing, to realize crop management, monitoring and yield estimation, has been concerned. Nowadays, the growth-monitoring and yield-estimating methods in rice, wheat and other annual crops develop rapidly with some achievements having already been put into service. But the yield estimation research on perennial economic crops is few. Taking peren- nial citrus trees as the research object, using ASD spectrometer to collect citrus canopy spectral, this article studied and analyzed the citrus of veget＆tion index and its relationship on yield, synthetically considered the influence of the agriculture pa- rameters on crop yield, and finally constructed the citrus yield estimation model based on the spectral data and agronomic parameters. Through the Significance Test and Samples＇ Test, olutained that the model＇s fitting degree was R=0.631, F= 13.201, P〈0.01 and the error rate of estimating accuracy was controlled in the range 3%-16%, proving that the model has statistical signification and reliability. It concluded that hyperspectral acquired from citrus canopy has substantial potential for citrus yield estimation. This study is an application and exploration of Hyperspectral Remote Sensing technology in the citrus yield estimation.
文摘On August 7,2015 the project＂Development of package technology for producing biodiesel from microalgae＂,which was jointly undertaken by the SINOPEC Research Institute of Petroleum Processing（RIPP）,the Fushun Research Institute of Petroleum and Petrochemicals（FRIPP）.
文摘The study was undertaken to assess the inorganic fertilizer production and consumption, export and import trends in Nigeria, assess the effect of food legume technology on farmers＇output, income, household inventories and inorganic fertilizer usage. Multi-stage sampling technique procedure was adopted in obtaining 300 respondents. Primary and secondary data were used. Simple descriptive statistics, t-test and correlation were used to analyse the data. Both the trend analysis result and test of mean differences showed a wide gap. The result revealed a significant increase in the yields of maize, millet, cocoyam, sweet potato, okro, tomato and overall aggregate crop yield of farmers after the adoption of the food legume technology （t = 2.78, 2.23, 3.70, 3.30, 2.20, 3.5 and 2.297; P 〈 0.05）, hence improves food security. Similarly, the result revealed significant positive change in terms of farmers＇ownership of house, increase in the number of rooms, improvement in water source, possession of radio, television/tape recorders and cell phone. Major constraints to production as revealed by the study include pests and diseases, low soil fertility, inadequate finance, storage problem and poor market for products. The study recommends adequate and regular supply of food legume production inputs to farmers and intensive control of pests and diseases.
基金Key Project of National Social Sciences Foundation"Transition and Upgrade of China’s Economic Structure under Global Value Chain"(11 AZD 002)Project of China Postdoctoral Science Foundation"Study on the Promotional Effect of Trade in Services on the Improvement of Status of China’s Yangtze River Delta Region in International Division of Labor"(Approval No.2013 M530809)
文摘Based on trade in value-added, this paper has estimated the revealed comparative advantage （RCA） of China＇s various manufacturing sectors between 1995 and 2011 and compared with the RCA indexes measured using conventional aggregate accounting approach. Results indicate that： （1） the RCA index measured using conventional aggregate accounting approach has underestimated China＇s comparative advantage of labor-intensive sectors but overestimated China＇s comparative advantage in capital, knowledge and technology-intensive manufacturing sectors, giving rise to a serious misjudgment. （2） The RCA measured using value-added approach shows that in the industry chain layout of global manufacturing sectors, China＇s comparative advantage is still concentrated in labor-intensive manufacturing sectors but has signs of weakening; in capital, knowledge and technology-intensive sectors, China is yet to develop any significant comparative advantage; there are signs that China is developing comparative advantage in capital-intensive sectors yet China＇s comparative disadvantage in knowledge and technology-intensive sectors has no significant tendency to improve. This result not only helps correct the misjudgment of China＇s competitiveness in manufacturing sectors based on conventional aggregate accounting approach but offers important policy implications for setting strategic directions and policies for China＇s manufacturing transition and upgrade.
基金supported by the Special Fund for Major State Basic Research Projects of China (2010CB732206, 2013CB228106)the Scientific Research Foundation of Graduate School of Southeast University (YBJJ1219)
文摘This paper presents thermodynamic evaluations of the agriculture residual-to-SNG process by thermochemical conversion, which mainly consists of the interconnected fluidized beds, hot gas cleaning, fluidized bed methanation reactor and Selexol absorption unit. The process was modeled using Aspen Plus soft-ware. The process performances, i.e., CH4 content in SNG~ higher heating value and yield of SNGexergy efficiencies with and without heat recovery, unit power consumption, were evaluated firstly. The results indicate that when the other parameters remain unchanged, the steam-to-biomass ratio at carbon boundary point is the optimal value for the process. Im proving the preheating temperatures of air and gasifying agent is beneficial for the SNG yield and exergy effi ciencies. Due to the effects of COz removal efficiency, there are two optimization objectives for the SNG produc tion process： （I） to maximize CH4 content in SNC or （II） to maximize SNG yield. Further, the comparison among different feedstocks indicates that the decreasing order of SNG yield is： corn stalk 〉 wheat straw 〉 rice straw. The evaluation on the potential of agriculture-based SNG shows that the potential annual production of agriculture re sidual-based SNG could be between 555 108 - 611 108 m3 with utilization of 100% of the available unexplored resources. The agriculture residual-based SNG could play a significant role on solving the big shortfall of China＇s natural gas supply in future.
